Fail- Types

Question 1

What is fail-open?

Answer 1

A failure mode where a device or system remains accessible or allows traffic to pass in order to maintain service availability — even if it compromises security.

Question 2

What is fail-safe?

Answer 2

Prioritizes safety — the system shuts down or defaults to a safe condition during failure (can vary depending on the context).

Question 3

What is fail-close?

Answer 3

Blocks access or stops traffic entirely during a failure — prioritizing security over availability.

Question 4

What is fail-secure?

Answer 4

Maintains a secure state during failure (e.g., keeping a door locked), even if that means denying access or shutting down.